Question

which element is essential for all life on earth? nitrogen oxygen carbon hydrogen

Explanation:

All life on Earth is based on carbon - based chemistry. Carbon can form a vast number of complex molecules (like carbohydrates, proteins, nucleic acids, lipids) due to its ability to form four covalent bonds, enabling the diversity of biochemical structures and functions necessary for life. While nitrogen, oxygen, and hydrogen are also essential, carbon is the fundamental building block for the molecular structures of all living organisms.

Answer:

C. Carbon